Electrophysiological differences between Hirayama disease, amyotrophic lateral sclerosis and cervical spondylotic amyotrophy

Table 1 Demographic characteristics of patients with HD, ALS or CSA

	HD	ALS	CSA	Normal controls
N	100	90	30	35
Male/Female	95/5	52/38	19/11	25/10
Mean onset age (years)	19.8 (14-27)	56.4 (36-72)	54.8 (42-76)	27.2(20-41)
Mean duration (months)	14.5 (6-30)	24.8 (3-48)	26.2 (3-60)
Unilateral upper limb affected	78	37	22
Bilateral upper limbs affected	22	53	8

HD, Hirayama disease; ALS, amyotrophic lateral sclerosis; CSA, cervical spondylotic amyotrophy.

ISSN: 1471-2474